FAST Telescope Maps Over 156,000 Neutral Hydrogen Sources

China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) has identified 156,411 neutral hydrogen sources across nearly half the sky. Published in Science China Physics, Mechanics & Astronomy, these findings are expected to significantly advance research into galaxy formation, evolution, dark matter distribution, and large-scale cosmic structures. This extensive mapping of neutral hydrogen is crucial for understanding the universe's early development.